Answer:
Explanation:
The main difficulty of barter system is the lack of double coincidence of wants. In a barter system a person who wants to exchange his goods must find some person who is willing to exchange his commodity with his commodity. Hope that helps!!!
Answer:
Two possible reasons for the massive extinction at the end of the Paleozoic Era are an asteroid collision and massive volcanic eruptions.
Explanation:
The massive extinction that occurred at the end of the Paleozoic Era is the biggest extinction from what is known so far. The majority of the species died out, and whole families of animals and plants were wiped out of the face of the Earth. It was only small and highly adaptable organisms that managed to survive and give rise to the later life-forms.
The two possible reasons for this massive extinction are an asteroid impact and massive volcanic eruptions. An asteroid collision would have created drastic changes in a matter of minutes and hours, with effects lasting for a long period of time, thus eliminating the majority of the life. Massive volcanic eruptions, with the Siberian super-volcano being the prime candidate, may have caused enormous amounts of carbon dioxide and sulfur dioxide to end up in the atmosphere, thus rapidly changing the living conditions on the planet.
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Your correct answer is B, a mercator map. the Mercator projection, the map most commonly seen hanging in classrooms and in text books, was created in 1596 to help sailors navigate the world. The familiar map gives the right shapes of land masses, but at the cost of distorting their sizes in favour of the wealthy lands to the north.<span>
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